Method and apparatus for allocating HARQ-ACK channel resources supporting transmit diversity and channel selection

ABSTRACT

Examples of the present invention provide a method for allocating Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) channel resources supporting transmit diversity and channel selection. The method includes: receiving, by a UE, Physical Downlink Control Channel (PDCCH) information and Physical Downlink Shared Channel (PDSCH) data from a base station through two Carrier Components (CCs); obtaining, by the UE according to specific indication information, Physical Uplink Control Channel (PUCCH) channel resources required for transmitting HARQ-ACK feedback information using a transmit diversity technique; and transmitting, by the UE, the HARQ-ACK feedback information on the obtained PUCCH channel resources adopting the transmit diversity technique. According to the method provided by the examples of the present invention, it is possible to allocate HARQ-ACK channel resources to the UE reasonably and avoid waste of channel resources in the premise that channel selection and SORTD technique are supported.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/714,978, filed Sep. 25, 2017, which is a continuation of U.S. patentapplication Ser. No. 14/395,805, filed Oct. 20, 2014, and now issued asU.S. Pat. No. 9,774,422, which is a 371 of International Application No.PCT/KR2013/003235 filed Apr. 17, 2013, which claims priority to ChinesePatent Application No. 201210119285.1 filed Apr. 20, 2012, thedisclosures of which are herein incorporated by reference in theirentirety.

BACKGROUND 1. Field

The present invention relates to radio communications techniques, andmore particularly, to a method and apparatus for allocating HARQ-ACKchannel resources supporting transmit diversity and channel selection.

2. Description of Related Art

At present, the maximum transmission bandwidth of Long-Term Evolution(LTE) systems is 20 MHz. It cannot meet the requirement of high datarate. Currently, in order to increase user's transmission rate,LTE-Advanced is proposed based on LTE. In LTE-A systems, multipleComponent Carriers (CCs) are aggregated to obtain a wider bandwidth andform uplink and downlink of the communication system, so as to supporthigher transmission rate. This technique is called Carrier Aggregation(CA). For example, in order to support 100 MHz bandwidth, five 20 MHzCCs may be aggregated. Herein, each CC is referred to as a cell.

Among multiple downlink CCs configured by a base station, one is aprimary cell (Pcell) and others are secondary cells (Scell). The basestation configures a UE to receive downlink data of multiple cellsthrough higher layer signaling. The number of cells scheduled in onesubframe may be smaller than or equal to the number of cells configuredby higher layers. For example, in FIG. 1, four cells are configured,respectively are cell 1 to cell 4. The base station schedules only onecell, i.e., cell 1. For another example, in FIG. 2, four cells areconfigured, respectively are cell 1 to cell 4. The base stationschedules three cells, i.e., cell 1, cell 2 and cell 3. Herein, datatransmission of one downlink cell may be scheduled by Physical DownlinkControl Channel (PDCCH) transmitted in other cells. This method isreferred to as cross-carrier scheduling. Or, the data transmission ofone downlink cell may be scheduled by the PDCCH of this cell. Thismethod is referred to as non cross-carrier scheduling.

Based on the CA technique, the base station transmits downlink data tothe same UE on multiple cells. Accordingly, the UE needs to feedbackHARQ-ACK information of the downlink data transmitted on multiple cells.According to a discuss result of LTE-A, the HARQ-ACK feedbackinformation of the data transmission on the cells is transmitted on oneuplink cell (i.e., uplink Pcell). In order to support the transmissionof multiple HARQ-ACK feedback bits, a method based on channel selectionmay be adopted in LTE-A to support at most 4 HARQ-ACK feedback bits.This method has been used in LTE TDD systems. In the case of channelselection of non-transmit-diversity, the number of HARQ-ACK resources tobe allocated is equal to that of HARQ-ACK feedback bits.

According to the discuss result of LTE-A, in LTE-A FDD systems, thechannel selection method supports at most 2 cells in fact, and each cellmay feed back one or two HARQ-ACK feedback bits. Herein, in the casethat Spatial Orthogonal Resource Transmit Diversity (SORTD) is notadopted to support transmit diversity, the method for allocating theHARQ-ACK channel resources is as follows.

For a downlink Pcell, the HARQ-ACK channel used by the HARQ-ACK feedbackinformation of the Pcell is determined according to a Control ChannelElement (CCE) index of the PDCCH via an implicit method.

For a downlink Scell, if cross-carrier scheduling is not adopted, theHARQ-ACK channel used by the HARQ-ACK feedback information of the Scellis determined according to a HARQ-ACK Resource Indicator (ARI) in thePDCCH scheduling the Scell; if the Scell is cross-carrier scheduled fromthe PDCCH of the Pcell, the HARQ-ACK channel used by the HARQ-ACKinformation of the Scell is determined via a implicit method accordingto the CCE index of the PDCCH.

If the Cell is configured with a Single Input Multiple Output (SIMO)transmission mode, since it is only required to feedback one HARQ-ACKwith respect to one Transmission Block (TB) of the Cell, one HARQ-ACKchannel needs to be allocated. Accordingly, if the Cell is configuredwith a Multiple Input Multiple Output (MIMO) transmission mode, twoHARQ-ACK need to be feedbacked with respect to two TBs of the Cell.Therefore, two HARQ-ACK channels need to be allocated.

SUMMARY

As to the situation of allocating HARQ-ACK channel via the implicitmethod, the HARQ-ACK channel used by the HARQ-ACK information of oneCell is obtained through the PDCCH scheduling the data transmission ofthe Cell. In particular, the index of a first CCE of the PDCCH isdenoted as n_(CCE). If one HARQ-ACK channel needs to be allocated, theHARQ-ACK channel may be mapped according to the index n_(CCE) of thefirst CCE. If two HARQ-ACK channels need to be allocated, the twoHARQ-ACK channels may be mapped according to the first CCE index n_(CCE)and the second CCE index n_(CCE)+1.

In addition, according to a current discussed result, in the case thatthe UE is configured with only one cell, the SORTD method is adopted tosupport transmit diversity. That is to say, two HARQ-ACK channels areallocated to the UE, two transmission antennas respectively usedifferent channels to transmit the same HARQ-ACK feedback informationrepeatedly. A receiver receives signals from the two channels andperforms a Maximum Ratio Combination (MRC) to obtain an optimaldiversity effect. Herein, the lowest CCE index of PDCCH is denoted by n.the two HARQ-ACK channels are obtained via the implicit method based onthe CCE indexes n and n+1. Corresponding to method for transmittingHARQ-ACK feedback information of the two CCs based on channel selection,in the case that transmit diversity needs to be supported, the SORTDtechnique may also be adopted. At this time, in order to feedback MHARQ-ACK bits, the number of required HARQ-ACK channels is 2M, whereinM=2, 3 or 4. However, there is no relevant solution at present as how toallocate the 2M HARQ-ACK channel resources, wherein the HARQ-ACKchannels resources refer to PUCCH channel resources used fortransmitting HARQ-ACK feedback information.

Examples of the present invention provide a method for allocatingHARQ-ACK channel resources supporting transmit diversity and channelselection, so as to allocate HARQ-ACK channel resources for a UE in thepremise that channel selection and SORTD technique are supported.

According to an example of the present invention, a method forallocating Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK)channel resources supporting transmit diversity and channel selection isprovided. The method includes:

receiving, by a UE, Physical Downlink Control Channel (PDCCH)information and Physical Downlink Shared Channel (PDSCH) data from abase station through two Component Carriers (CCs);

obtaining, by the UE according to specific indication information,Physical Uplink Control Channel (PUCCH) channel resources required fortransmitting HARQ-ACK feedback information using a transmit diversitytechnique; and

transmitting, by the UE, the HARQ-ACK feedback information on theobtained PUCCH channel resources adopting the transmit diversitytechnique.

Preferably, the UE obtains at most 4 PUCCH 1a/1b channel resources ofeach CC according to the specific indication information, and transmitsthe HARQ-ACK feedback information adopting a Spatial Orthogonal ResourceTransmit Diversity (SORTD) technique using PUCCH format 1b with channelselection.

Preferably, the UE is configured with a Frequency Division Duplexing(FDD).

Preferably, if the CC is a primary CC and is configured with a SingleInput Multiple Output (SIMO) transmission mode, the CC requires 2 PUCCH1a/1b channel resources to transmit the HARQ-ACK feedback information,denoted by CH_1 and CH_2;

the specific indication information is the lowest Control ChannelElement (CCE) index n of the PDCCH scheduling the PDSCH of the primarycell; and

CH_1 and CH_2 are obtained by mapping according to CCE indexes n andn+1.

Preferably, if the CC is a Pcell and is configured with a Multiple InputMultiple Output (MIMO) transmission mode, the CC requires 4 PUCCH 1a/1bchannel resources to transmit the HARQ-ACK feedback information, denotedby CH_1, CH_2, CH_3 and CH_4;

CH_1 and CH_2 are obtained by mapping according to CCE indexes n and n+1of the PDCCH scheduling the PDSCH of the Pcell, wherein n is the lowestCCE index of the PDCCH;

CH_3 and CH_4 are obtained through any one of:

mapping according to CCE indexes n+2 and n+3 of the PDCCH scheduling thePDSCH of the Pcell, wherein n is the lowest CCE index of the PDCCH;

configuring 2 PUCCH 1a/1b channel resources semi-statically by higherlayer signaling;

configuring multiple PUCCH 1a/1b channel resource semi-statically byhigher layer signaling, obtaining 2 PUCCH channel resources throughmapping multiple HARQ-ACK channels according to HARQ-ACK Resourceindicator (ARI) in the PDCCH scheduling data transmission of the Pcell;and

configuring multiple PUCCH 1a/1b channel resource semi-statically byhigher layer signaling, obtaining 2 PUCCH channel resources throughmapping multiple HARQ-ACK channels according to the ARI in the PDCCHscheduling data transmission of the Scell.

Preferably, if the CC is a Scell and is configured with a SIMOtransmission mode, the CC requires 2 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1 and CH_2;

if the Scell is cross-carrier scheduled by the Pcell, the specificindication information is the lowest CCE index n of the PDCCH schedulingthe PDSCH of the Scell, and CH_1 and CH_2 are obtained through mappingaccording to CCE indexes n and n+1.

Preferably, if the CC is a Scell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4; if the Scell is cross-carrier scheduled by the Pcell,

CH_1 and CH_2 are obtained through mapping according to CCE indexes nand n+1 of the PDCCH scheduling the PDSCH of the Scell, wherein n is thelowest CCE index of the PDCCH;

CH_3 and CH_4 are obtained through any one of:

mapping according to CCE indexes n+2 and n+3 of the PDCCH scheduling thePDSCH of the Scell, wherein n is the lowest CCE index of the PDCCH;

configuring 2 PUCCH 1a/1b channel resources semi-statically by higherlayer signaling; and

configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping multiple HARQ-ACK channels according to ARI in the PDCCHscheduling the PDSCH of the Scell.

Preferably, if the CC is a Scell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4;

if the Scell is cross-carrier scheduled by the Pcell, CH_1, CH_2, CH_3and CH_4 are obtained by: configuring multiple PUCCH 1a/1b channelresources semi-statically by higher layer signaling, and obtaining 4PUCCH 1a/1b channel resources through mapping multiple HARQ-ACK channelsaccording to ARI in the PDCCH scheduling the PDSCH of the Scell.

Preferably, if the CC is a Scell and is configured with a SIMOtransmission mode, the CC requires 2 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1 and CH_2;

if the Scell is scheduled by itself, CH_1 and CH_2 are obtained by:configuring multiple PUCCH 1a/1b channel resource semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping multiple HARQ-ACK channels according to ARI in the PDCCHscheduling the PDSCH of the Scell.

Preferably, if the CC is a Scell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4;

if the Scell is scheduled by itself, CH_1, CH_2, CH_3 and CH_4 areobtained by: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 4 PUCCH 1a/1bchannel resources through mapping multiple HARQ-ACK channels accordingto ARI in the PDCCH scheduling the PDSCH of the Scell.

Preferably, the UE is configured with a Time Division Duplexing (TDD),and the number of elements in a Downlink Association Set (DAS) of the CCis 1.

Preferably, if the CC is a Pcell and is configured with a SIMOtransmission mode, the CC requires 2 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1 and CH_2;

the specific indication information is the lowest CCE index n of thePDCCH scheduling the PDSCH of the Pcell;

CH_1 and CH_2 are obtained by mapping according to CCE indexes n andn+1.

Preferably, if the CC is a Pcell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4;

CH_1 and CH_2 are obtained by mapping according to CCE indexes n and n+1of the PDCCH scheduling the PDSCH of the Pcell, wherein n is the lowestCCE index of the PDCCH;

CH_3 and CH_4 are obtained through any one of:

mapping according to CCE indexes n+2 and n+3 of the PDCCH scheduling thePDSCH of the Pcell, wherein n is the lowest CCE index of the PDCCH;

configuring 2 PUCCH 1a/1b channel resources semi-statically by higherlayer signaling;

configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping multiple HARQ-ACK channels according to ARI in the PDCCHscheduling data transmission of the Pcell; and

configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping multiple HARQ-ACK channels according to ARI in the PDCCHscheduling data transmission of the Scell.

Preferably, if the UE is configured with the TDD and the number ofelements in the DAS of the CC is 1, values in a Downlink AllocationIndex (DAI) field is taken as the ARI, and the PUCCH 1a/1b channelresources of CH_3 and CH_4 are obtained through mapping according totable 1.

TABLE 1 DAI values {CH_3, CH_4} channel resources obtained by mapping 0,0 The first set including two PUCCH resources configured by higherlayers 0, 1 The second set including two PUCCH resources configured byhigher layers 1, 0 The third set including two PUCCH resourcesconfigured by higher layers 1, 1 The fourth set including two PUCCHresources configured by higher layers

Preferably, if the CC is a Scell and is configured with a SIMOtransmission mode, the CC requires 2 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1 and CH_2;

if the Scell is cross-carrier scheduled by the Pcell, the specificindication information is the lowest CCE index n of the PDCCH schedulingthe PDSCH of the Scell, CH_1 and CH_2 are obtained through mappingaccording to the CCE indexes n and n+1.

Preferably, if the CC is a Scell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4; if the Scell is cross-carrier scheduled by the Pcell,

CH_1 and CH_2 are obtained by mapping according to CCE indexes n and n+1of the PDCCH scheduling the PDSCH of the Scell, wherein n is the lowestCCE index of the PDCCH;

CH_3 and CH_4 are obtained through any one of:

mapping according to CCE indexes n+2 and n+3 of the PDCCH scheduling thePDSCH of the Scell, wherein n is the lowest CCE index of the PDCCH;

configuring 2 PUCCH 1a/1b channel resources semi-statically by higherlayer signaling;

configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping multiple HARQ-ACK channels according to ARI in the PDCCHscheduling the PDSCH of the Scell.

Preferably, if the CC is a Scell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4;

if the Scell is cross-carrier scheduled by the Pcell, CH_1, CH_2, CH_3and CH_4 are obtained through: configuring multiple PUCCH 1a/1b channelresources semi-statically by higher layer signaling, and obtaining 4PUCCH 1a/1b channel resources through mapping multiple HARQ-ACK channelsaccording to ARI in the PDCCH scheduling the PDSCH of the Scell.

Preferably, if the CC is a Scell and is configured with a SIMOtransmission mode, the CC requires 2 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1 and CH_2;

if the Scell is scheduled by itself, CH_1 and CH_2 are obtained through:configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping multiple HARQ-ACK channels according to ARI in the PDCCHscheduling the PDSCH of the Scell.

Preferably, if the CC is a Scell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4;

if the Scell is scheduled by itself, CH_1, CH_2, CH_3 and CH_4 areobtained through: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 4 PUCCH 1a/1bchannel resources through mapping multiple HARQ-ACK channels accordingto ARI in the PDCCH scheduling the PDSCH of the Scell.

Preferably, the UE is configured with a TDD and the number of elementsin a DAS of the CC is 2.

Preferably, if the CC is a Pcell and is configured with a MIMOtransmission mode, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4; subframe 0 and 1 respectively provide 2 PUCCH 1a/1b channelresources; if no Semi-Persistent Scheduling (SPS) service is configuredin the subframes, HARQ-ACK resource of CH_1 is determined according tothe lowest CCE index n of the PDCCH of subframe 0 scheduling the PDSCH,HARQ-ACK resource of CH_2 is determined according to CCE index n+1 ofthe PDCCH of subframe 0 scheduling the PDSCH, HARQ-ACK resource of CH_3is determined according to the lowest CCE index m of the PDCCH ofsubframe 1 scheduling the PDSCH, and HARQ-ACK resource of CH_4 isdetermined according to CCE index m+1 of the PDCCH of subframe 1scheduling the PDSCH; if the SPS service is configured in the subframe,2 PUCCH 1a/1b channel resources required by the subframe are 2 HARQ-ACKresources semi-statically configured by higher layer signaling.

Preferably, if the CC is a Scell, the CC requires 4 PUCCH 1a/1b channelresources to transmit the HARQ-ACK feedback information, denoted byCH_1, CH_2, CH_3 and CH_4; subframe 0 and 1 respectively provide 2 PUCCH1a/1b channel resources; if the PDSCH of the Scell is cross-carrierscheduled by the PDCCH of the Pcell, HARQ-ACK resource of CH_1 isdetermined according to the lowest CCE index n of the PDCCH of subframe0 scheduling the PDSCH, HARQ-ACK resource of CH_2 is determinedaccording to CCE index n+1 of the PDCCH of subframe 0 scheduling thePDSCH, HARQ-ACK resource of CH_3 is determined according to the lowestCCE index m of the PDCCH of subframe 1 scheduling the PDSCH, andHARQ-ACK resource of CH_4 is determined according to CCE index m+1 ofthe PDCCH of subframe 1 scheduling the PDSCH, wherein the lowest CCEindex is n.

Preferably, if the CC is a Scell, the CC requires 4 PUCCH 1a/1b channelresources to transmit the HARQ-ACK feedback information, denoted byCH_1, CH_2, CH_3 and CH_4; if the Scell is scheduled by itself, themethod for obtaining the CH_1, CH_2, CH_3 and CH_4 comprises:configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 4 PUCCH 1a/1b channel resources bymapping the multiple HARQ-ACK channels according to ARI in the PDCCHscheduling the PDSCH of the Scell

Preferably, the UE is configured with a TDD working manner and thenumber of elements in a DAS of the CC is larger than 2.

Preferably, if the CC is a Pcell, the CC requires 4 PUCCH 1a/1b channelresources to transmit the HARQ-ACK feedback information, denoted byCH_1, CH_2, CH_3 and CH_4; if no SPS service is configured in the cell,HARQ-ACK resource of CH_1 is determined according to the lowest CCEindex n of the PDCCH of a subframe with DAI=1 scheduling the PDSCH,HARQ-ACK resource of CH_2 is determined according to CCE index n+1 ofthe PDCCH of the subframe with DAI=1 scheduling the PDSCH, HARQ-ACKresource of CH_3 is determined according to the lowest CCE index m ofthe PDCCH of a subframe with DAI=2 scheduling the PDSCH, and HARQ-ACKresource of CH_4 is determined according to CCE index m+1 of the PDCCHof the subframe with DAI=2 scheduling the PDSCH; if the SPS service isconfigured in the subframe, 2 HARQ-ACK resources are configured byhigher layers for the SPS service semi-statically, wherein CH_1 is thefirst HARQ-ACK resource configured semi-statically by the higher layersfor the SPS service, CH_2 is the second HARQ-ACK resource configuredsemi-statically by the higher layers for the SPS service; HARQ-ACKresource of CH_3 is determined according to the lowest CCE index n ofthe PDCCH of the subframe with DAI=1 scheduling the PDSCH, and HARQ-ACKresource of CH_4 is determined according to the CCE index n+1 of thePDCCH of the subframe with DAI=1 scheduling the PDSCH.

Preferably, if the CC is a Scell, the CC requires 4 PUCCH 1a/1b channelresources to transmit the HARQ-ACK feedback information, denoted byCH_1, CH_2, CH_3 and CH_4; if the PDSCH of the Scell is cross-carrierscheduled by the PDCCH of the Pcell, HARQ-ACK resource of CH_1 isdetermined according to the lowest CCE index n of the PDCCH of asubframe with DAI=1 scheduling the PDSCH, HARQ-ACK resource of CH_2 isdetermined according to CCE index n+1 of the PDCCH of the subframe withDAI=1 scheduling the PDSCH, HARQ-ACK resource of CH_3 is determinedaccording to the lowest CCE index m of the PDCCH of a subframe withDAI=2 scheduling the PDSCH, and HARQ-ACK resource of CH_4 is determinedaccording to CCE index m+1 of the PDCCH of the subframe with DAI=2scheduling the PDSCH.

Preferably, if the CC is a Scell, the CC requires 4 PUCCH 1a/1b channelresources to transmit the HARQ-ACK feedback information, denoted byCH_1, CH_2, CH_3 and CH_4; if the Scell is scheduled by itself, themethod for obtaining the CH_1, CH_2, CH_3 and CH_4 is as follows:configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 4 PUCCH 1a/1b channel resources bymapping the multiple HARQ-ACK channels according to ARI in the PDCCHscheduling the PDSCH of the Scell.

It can be seen from the above technical solution that, according to themethod for allocating HARQ-ACK channel resources provided by theexamples of the present invention, it is possible to allocate HARQ-ACKchannel resources to the UE reasonably and avoid waste of channelresources in the premise that channel selection and SORTD technique aresupported.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram illustrating scheduling of one cell by thebase station according to the prior art.

FIG. 2 is a schematic diagram illustrating scheduling of three cells bythe base station according to the prior art.

FIG. 3 is a flowchart illustrating a method for allocating HARQ-ACKchannel resources supporting transmit diversity and channel selectionaccording to an example of the present invention.

FIG. 4 is illustrating the UE apparatus according to an exemplaryembodiment of the present invention.

FIG. 5 is illustrating the Node B apparatus according to an exemplaryembodiment of the present invention.

DETAILED DESCRIPTION

The present invention will be described in further detail hereinafterwith reference to accompanying drawings and embodiments to make theobjective, technical solution and merits therein clearer.

In order to solve the above technical problem, an example of the presentinvention provides a method for allocating HARQ-ACK channel resourceswhen HARQ-ACK feedback information is transmitted based on channelselection and SORTD technique is used to support transmit diversity.Through the method, it is ensured that resources occupied by SORTDtechnique are as less as possible.

Two transmission antennas will be mentioned in the followingdescription. Herein, each antenna may be a physical transmission antennaor composed by signals of multiple physical antennas. For example, for aUE configured with four physical antennas, in order to supporttwo-antenna transmit diversity, each antenna may consist of two physicalantennas. In the case that SORTD is not adopted, if the number ofHARQ-ACK feedback bits is M, M HARQ-ACK channels need to be allocated.Accordingly, in the case that SORTD is adopted, 2M HARQ-ACK channelsneeds to be allocated and divided into two groups, wherein each groupincludes M channels. Thus, each antenna selects one channel for use fromthe M HARQ-ACK channels of one group. In order to simplify thedesignation, suppose that the two antennas adopt same channel selectionmapping table which is the same as that when SORTD is not adopted.

The method for allocating HARQ-ACK channel resources supporting transmitdiversity and channel selection is as shown in FIG. 3. The methodincludes the following.

At step 301, the UE receives Physical Downlink Control Channel (PDCCH)information and Physical Downlink Shared Channel (PDSCH) datatransmitted by the base station via two CCs.

At step 302, the UE obtains PUCCH channel resources used fortransmitting HARQ-ACK feedback information based on transmit diversitytechnique (e.g., SORTD technique) according to specific indicationinformation.

At step 303, the UE transmits the HARQ-ACK feedback information to thebase station based on the transmit diversity technique on the PUCCHchannel resources obtained.

Now, the flow shown in FIG. 3 ends.

For step 302, there are the following cases.

Case 1:

If the UE is configured with a FDD, the UE obtains at most 4 PUCCH 1a/1bchannel resources of each CC according to the specific indicationinformation. The HARQ-ACK feedback information is transmitted usingPUCCH format 1b with channel selection based on the SORTD technique.

Case 1-1:

If the CC is a Pcell and is configured with a Single Input MultipleOutput (SIMO) transmission mode, the CC requires 2 PUCCH 1a/1b channelresources to transmit the HARQ-ACK feedback information, denoted byCH_1, CH_2. At this time, the specific indication information refers tothe lowest CCE index n of the PDCCH scheduling the PDSCH of the CC. CH_1and CH_2 may be obtained through mapping according to CCE indexes n andn+1.

Case 1-2:

If the CC is a Pcell and is configured with MIMO transmission mode, theCC requires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4, wherein CH_1and CH_2 may be obtained through mapping according to the CCE indexes nand n+1 of the PDCCH scheduling the PDSCH of the CC, n is the lowest CCEindex of the PDCCH; CH_3 and CH_4 may be obtained according to any oneof the following 4 methods.

Method 1: CH_3 and CH_4 are obtained through mapping according to CCEindexes n+2 and n+3 of the PDCCH scheduling the PDSCH of the CC, whereinn is the lowest CCE index of the PDCCH.

Method 2: configuring two PUCCH 1a/1b channel resources semi-staticallyby higher layer signaling.

Method 3: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources by mapping the multiple HARQ-ACK channels according toHARQ-ACK Resource indicator (ARI) of the PDCCH scheduling datatransmission of the Pcell.

Method 4: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources by mapping the multiple HARQ-ACK channels according tothe ARI of the PDCCH scheduling the Scell.

Case 1-3:

If the CC is a Scell and is configured with the SIMO transmission mode,the CC requires 2 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2. If the Scell iscross-carrier scheduled by the Pcell, CH_1 and CH_2 are obtained bymapping according to CCE indexes n and n+1 of the PDCCH scheduling thePDSCH, wherein n is the lowest CCE index of the PDCCH.

Case 1-4:

If the CC is a Scell and is configured with the MIMO transmission mode,the CC requires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4.

If the Scell is cross-carrier scheduled by the Pcell, CH_1 and CH_2 areobtained by mapping according to CCE indexes n and n+1 of the PDCCHscheduling the PDSCH, wherein n is the lowest CCE index of the PDCCH.CH_3 and CH_4 are obtained according to any one of the following threemethods.

Method 1: CH_3 and CH_4 are obtained by mapping according to CCE indexesn+2 and n+3 of the PDCCH scheduling the PDSCH of the CC, wherein n isthe lowest CCE index of the PDCCH.

Method 2: configuring two PUCCH 1a/1b channel resources semi-staticallyby higher layer signaling.

Method 3: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources by mapping the multiple HARQ-ACK channels according tothe ARI of the PDCCH scheduling the PDSCH of the Scell.

If the Scell is cross-carrier scheduled by the Pcell, another method forobtaining CH_1, CH_2, CH_3 and CH_4 is as follows: configuring multiplePUCCH 1a/1b channel resources semi-statically by higher layer signaling,obtaining 4 PUCCH 1a/1b channel resources by mapping the multipleHARQ-ACK channels according to the ARI of the PDCCH scheduling the PDSCHof the Scell.

Case 1-5:

If the CC is a Scell and is configured with the SIMO transmission mode,the CC requires 2 PUCCH 1a/1b channel resource to transmit the HARQ-ACKfeedback information, denoted by CH_1 and CH_2. If the Scell isscheduled by itself, CH_1 and CH_2 are obtained as follows: configuringmultiple PUCCH 1a/1b channel resources semi-statically by higher layersignaling, and obtaining 2 PUCCH 1a/1b channel resources by mapping themultiple HARQ-ACK channels according to the ARI of the PDCCH schedulingthe PDSCH of the Scell.

Case 1-6:

If the CC is a Scell and is configured with the MIMO transmission mode,the CC requires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4. If the Scellis scheduled by itself, the method for obtaining CH_1, CH_2, CH_3 andCH_4 is as follows: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 4 PUCCH 1a/1bchannel resources by mapping the multiple HARQ-ACK channels according tothe ARI of the PDCCH scheduling the PDSCH of the Scell.

Case 2:

If the UE is configured with a TDD working manner and the number ofelements in Downlink Association Set (DAS) of the CC is 1, the UEobtains at most 4 PUCCH 1a/1b channel resources of each CC according tothe specific indication information.

Case 2-1:

If the CC is a Pcell and is configured with the SIMO transmission mode,the CC requires 2 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1 and CH_2. CH_1 and CH_2 may beobtained by mapping according to CCE indexes n and n+1 of the PDCCHscheduling the PDSCH, wherein n is the lowest CCE index of the PDCCH.

Case 2-2:

If the CC is a Pcell and is configured with the MIMO transmission mode,the CC requires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4. CH_1 andCH_2 are obtained by mapping according to CCE indexes n and n+1 of thePDCCH scheduling the PDSCH, wherein n is the lowest CCE index of thePDCCH. CH_3 and CH_4 may be obtained through any one of the followingthree methods.

Method 1: CH_3 and CH_4 are obtained by mapping according to CCE indexesn+2 and n+3 of the PDCCH scheduling the PDSCH of the CC, wherein n isthe lowest CCE index of the PDCCH.

Method 2: configuring two PUCCH 1a/1b channel resources semi-staticallyby higher layer signaling.

Method 3: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining through 2 PUCCH1a/1b channel resources by mapping the multiple HARQ-ACK channelsaccording to the ARI of the PDCCH scheduling data transmission of thePcell. In particular, in LTE Rel-10, when the PDCCH of the Pcellschedules the PDSCH of the Pcell, Transmission Power Control (TPC) inthe PDCCH is used for power control command and cannot be used as ARI.Thus, a new field is required to serve as the ARI. If the CA system isconfigured with the TDD transmission and the number of elements in theDAS of the CC is equal to 1, the Downlink Assignment Index (DAI) of thePDCCH exists but is not used. In the present invention, the DAI field isused as the ARI. Thus, the PUCCH 1a/1b channel resources of CH_3 andCH_4 may be obtained through mapping. The detailed method is shown intable 2.

TABLE 2 DAI values {CH_3, CH_4} channel resources obtained by mapping 0,0 The first set including two PUCCH resources configured by higherlayers 0, 1 The second set including two PUCCH resources configured byhigher layers 1, 0 The third set including two PUCCH resourcesconfigured by higher layers 1, 1 The fourth set including two PUCCHresources configured by higher layers

According to table 2, if the value of the DAI field is “0, 0”, the UE isindicated to use the first set which is configured by higher layers andincludes two PUCCH resources as CH_3 and CH_4. If the value of the DAIfield is “0, 1”, the UE is indicated to use the second set which isconfigured by higher layers and includes two PUCCH resources as CH_3 andCH_4. If the value of the DAI field is “1, 0”, the UE is indicated touse the third set which is configured by higher layers and includes twoPUCCH resources as CH_3 and CH_4. If the value of the DAI field is “1,1”, the UE is indicated to use the fourth set which is configured byhigher layers and includes two PUCCH resources as CH_3 and CH_4.

Method 4: another method for obtaining the CH_3 and CH_4 is as follows:configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping the multiple HARQ-ACK channels according to the ARI inthe PDCCH scheduling the Scell.

Case 2-3:

If the CC is a Scell and is configured with the SIMO transmission mode,the CC requires 2 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1 and CH_2. If the Scell iscross-carrier scheduled by the Pcell, CH_1 and CH_2 are obtained bymapping according to CCE indexes n and n+1 of the PDCCH scheduling thePDSCH, wherein n is the lowest CCE index of the PDCCH.

Case 2-4:

If the CC is a Scell and is configured with the MIMO transmission mode,the CC requires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4.

If the Scell is cross-carrier scheduled by the Pcell, CH_1 and CH_2 maybe obtained by mapping according to the CCE indexes n and n+1 of thePDCCH scheduling the PDSCH, wherein n is the lowest CCE index of thePDCCH; CH_3 and CH_4 may be obtained through any one of the followingthree methods.

Method 1: CH_3 and CH_4 are mapped according to CCE indexes n+2 and n+3of the PDCCH scheduling the PDSCH of the CC, wherein n is the lowest CCEindex of the PDCCH.

Method 2: configuring two PUCCH 1a/1b channel resources semi-staticallyby higher layer signaling.

Method 3: configuring multiple PUCCH 1a/1b channel resources aresemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources by mapping the multiple HARQ-ACK channels according tothe ARI of the PDCCH scheduling the PDSCH of the Scell.

If the Scell is cross-carrier scheduled by the Pcell, another method forobtaining CH_1, CH_2, CH_3 and CH_4 is as follows: configuring multiplePUCCH 1a/1b channel resources semi-statically by higher layer signaling,and obtaining 4 PUCCH 1a/1b channel resources by mapping the multipleHARQ-ACK channels according to the ARI of the PDCCH scheduling the PDSCHof the Scell.

Case 2-5:

If the CC is a Scell and is configured with the SIMO transmission mode,the CC requires 2 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1 and CH_2. If the Scell isscheduled by itself, CH_1 and CH_2 are obtained through the followingmethod: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources through mapping the multiple HARQ-ACK channelsaccording to the ARI in the PDCCH scheduling the PDSCH of the Scell.

Case 2-6:

If the CC is a Scell and is configured with the MIMO transmission mode,the CC requires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4. If the Scellis scheduled by itself, CH_1, CH_2, CH_3 and CH_4 are obtained throughthe following method: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 4 PUCCH 1a/1bchannel resources through mapping the multiple HARQ-ACK channelsaccording to the ARI in the PDCCH scheduling the PDSCH of the Scell.

If the Pcell falls within case 1-1 or case 2-1 and the Scell fallswithin any one of cases 1-3, 1-5, 2-3 and 2-5, the UE transmits theHARQ-ACK feedback information on antenna 0 using CH_1 resource andtransmits the HARQ-ACK feedback information repeatedly on antenna 1using CH_2 resource, as shown in table 3.

TABLE 3 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel resources Antenna 0 Pcell CH_1 of PcellScell CH_1 of Scell Antenna 1 Pcell CH_2 of Pcell Scell CH_2 of Scell

If the Pcell falls within case 1-2 or case 2-2 and the Scell fallswithin any one of cases 1-4, 1-6, 2-4 and 2-6, suppose that ch_a, ch_b,ch_c, ch_d are channels which are used during channel selection when theSORTD is not adopted.

Then, a channel resources mapping manner supporting channel selectionand SORTD transmit diversity is as follows.

The UE transmits the HARQ-ACK feedback information on antenna 0 usingCH_1 and CH_3 and transmits the HARQ-ACK feedback information repeatedlyon antenna 1 using CH_2 and CH_4, as shown in table 4

TABLE 4 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 0 Pcell ch_a CH_1 of Pcell ch_b CH_3 of PcellScell ch_c CH_1 of Scell ch_d CH_3 of Scell Antenna 1 Pcell ch_a CH_2 ofPcell ch_b CH_4 of Pcell Scell ch_c CH_2 of Scell ch_d CH_4 of Scell

Another channel resources mapping method supporting channel selectionand SORTD transmit diversity is as follows.

The UE transmits the HARQ-ACK feedback information on antenna 0 usingCH_1 and CH_2 and transmits the HARQ-ACK feedback information repeatedlyon antenna 1 using CH_3 and CH_4, as shown in table 5.

TABLE 5 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 0 Pcell ch_a CH_1 of Pcell ch_b CH_2 of PcellScell ch_c CH_1 of Scell ch_d CH_2 of Scell Antenna 1 Pcell ch_a CH_3 ofPcell ch_b CH_4 of Pcell Scell ch_c CH_3 of Scell ch_d CH_4 of Scell

Another channel resources mapping method supporting channel selectionand SORTD transmit diversity is as follows.

The UE transmits the HARQ-ACK feedback information on antenna 0 usingCH_1 and CH_3 and transmits the HARQ-ACK feedback information repeatedlyon antenna 1 using CH_2 and CH_4, as shown in table 6.

TABLE 6 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 0 Pcell ch_a CH_1 of Pcell ch_b CH_3 of PcellScell ch_c CH_3 of Scell ch_d CH_1 of Scell Antenna 1 Pcell ch_a CH_2 ofPcell ch_b CH_4 of Pcell Scell ch_c CH_4 of Scell ch_d CH_2 of Scell

If the Pcell falls within case 1-1 or case 2-1 and the Scell fallswithin any one of cases 1-4, 1-6, 2-4 and 2-6, the Pcell is referred toas Cell_2, the Scell is referred to as Cell_1. If the Pcell falls withincase 1-2 or case 2-2 and the Scell falls within any one of case 1-3,1-5, 2-3 and 2-5, the Pcell is referred to as Cell_1 and the Scell isreferred to as Cell_2. At this time, there are the following three kindsof channel resources mapping methods supporting channel selection andSORTD transmit diversity as shown in tables 7-9. In particular, onechannel resources mapping method supporting channel selection and SORTDtransmit diversity is as follows.

The UE transmits the HARQ-ACK feedback information on antenna 0 usingCH_1 and CH_3 and transmits the HARQ-ACK feedback information repeatedlyon antenna 1 using CH_2 and CH_4, as shown in table 7.

TABLE 7 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 1 Cell_1 ch_a CH_1 of Cell_1 ch_b CH_3 ofCell_1 Cell_2 ch_c CH_1 of Cell_2 Antenna 2 Cell_1 ch_a CH_2 of Cell_1ch_b CH_4 of Cell_1 Cell_2 ch_c CH_2 of Cell_2

Another channel resources mapping method supporting channel selectionand SORTD transmit diversity is as follows.

The UE transmits the HARQ-ACK feedback information on antenna 0 usingCH_1 and CH_2 and transmits the HARQ-ACK feedback information repeatedlyon antenna 1 using CH_3 and CH_4, as shown in table 8.

TABLE 8 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 1 Cell_1 ch_a CH_1 of Cell_1 ch_b CH_2 ofCell_1 Cell_2 ch_c CH_1 of Cell_2 Antenna 2 Cell_1 ch_a CH_3 of Cell_1ch_b CH_4 of Cell_1 Cell_2 ch_c CH_2 of Cell_2

Another channel resources mapping method supporting channel selectionand SORTD transmit diversity is as follows.

The UE transmits the HARQ-ACK feedback information on antenna 0 usingCH_1 and CH_3 and transmits the HARQ-ACK feedback information repeatedlyon antenna 1 using CH_2 and CH_4, as shown in table 9.

TABLE 9 Channel resources mapping table supporting channel selection andSORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 1 Cell_1 ch_a CH_3 of Cell_1 ch_b CH_1 ofCell_1 Cell_2 ch_c CH_1 of Cell_2 Antenna 2 Cell_1 ch_a CH_4 of Cell_1ch_b CH_2 of Cell_1 Cell_2 ch_c CH_2 of Cell_2

Case 3:

If the UE is configured with the TDD working manner and the number ofelements in the DAS of the CC is 2, the UE obtains at most 4 PUCCH 1a/1bchannel resources of each CC according to the specific indicationinformation.

Case 3-1:

If the CC is a Pcell, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. Subframes 0 and 1 respectively provide 2 PUCCH 1a/1b channelresources. If no Semi-Persistent Scheduling (SPS) service is configuredin the subframes, the HARQ-ACK resource of CH_1 is determined accordingto the lowest CCE index n of the PDCCH of subframe 0 scheduling thePDSCH, the HARQ-ACK resource of CH_2 is determined according to the CCEindex n+1 of the PDCCH of subframe 0 scheduling the PDSCH, the HARQ-ACKresource of CH_3 is determined according to the lowest CCE index m ofthe PDCCH of subframe 1 scheduling the PDSCH, and the HARQ-ACK resourceof CH_4 is determined according to the CCE index m+1 of the PDCCH ofsubframe 1 scheduling the PDSCH. If the SPS service is configured in thesubframe, 2 PUCCH 1a/1b channel resources required by the subframe are 2HARQ-ACK resources semi-statically configured by higher layer signaling.

Case 3-2:

If the CC is a Scell, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. Subframes 0 and 1 respectively provide 2 PUCCH 1a/1b channelresources. If the PDSCH of the Scell is cross-carrier scheduled by thePDCCH of the Pcell, the HARQ-ACK resource of CH_1 is determinedaccording to the lowest CCE index n of the PDCCH of subframe 0scheduling the PDSCH, the HARQ-ACK resource of CH_2 is determinedaccording to the CCE index n+1 of the PDCCH of subframe 0 scheduling thePDSCH, the HARQ-ACK resource of CH_3 is determined according to thelowest CCE index m of the PDCCH of subframe 1 scheduling the PDSCH, andthe HARQ-ACK resource of CH_4 is determined according to the CCE indexm+1 of the PDCCH of subframe 1 scheduling the PDSCH.

Case 3-3:

If the CC is a Scell, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. If the Scell is scheduled by itself, the method for obtainingthe CH_1, CH_2, CH_3 and CH_4 is as follows: configuring multiple PUCCH1a/1b channel resources semi-statically by higher layer signaling, andobtaining 4 PUCCH 1a/1b channel resources by mapping the multipleHARQ-ACK channels according to the ARI in the PDCCH scheduling the PDSCHof the Scell.

Case 4:

If the UE is configured with the TDD working manner and the number ofelements in the DSA of the CC is 3 or 4, the UE obtains at most 4 PUCCH1a/1b channel resources of each CC according to the specific indicationinformation.

Case 4-1:

If the CC is a Pcell, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4.

If no SPS service is configured in the cell, the HARQ-ACK resource ofCH_1 is determined according to the lowest CCE index n of the PDCCH ofthe subframe with DAI=1 scheduling the PDSCH, the HARQ-ACK resource ofCH_2 is determined according to the CCE index n+1 of the PDCCH of thesubframe with DAI=1 scheduling the PDSCH, the HARQ-ACK resource of CH_3is determined according to the lowest CCE index m of the PDCCH of thesubframe with DAI=2 scheduling the PDSCH, and the HARQ-ACK resource ofCH_4 is determined according to the CCE index m+1 of the PDCCH of thesubframe with DAI=2 scheduling the PDSCH.

If the SPS service is configured in the subframe, 2 HARQ-ACK resourcesare configured by higher layers for the SPS service semi-statically.CH_1 is the first HARQ-ACK resource configured semi-statically by thehigher layers for the SPS service, CH_2 is the second HARQ-ACK resourceconfigured semi-statically by the higher layers for the SPS service. TheHARQ-ACK resource of CH_3 is determined according to the lowest CCEindex n of the PDCCH of the subframe with DAI=1 scheduling the PDSCH,and the HARQ-ACK resource of CH_4 is determined according to the CCEindex n+1 of the PDCCH of the subframe with DAI=1 scheduling the PDSCH.

Case 4-2:

If the CC is a Scell, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. If the PDSCH of the Scell is cross-carrier scheduled by thePDCCH of the Pcell, the HARQ-ACK resource of CH_1 is determinedaccording to the lowest CCE index n of the PDCCH of the subframe withDAI=1 scheduling the PDSCH, the HARQ-ACK resource of CH_2 is determinedaccording to the CCE index n+1 of the PDCCH of the subframe with DAI=1scheduling the PDSCH, the HARQ-ACK resource of CH_3 is determinedaccording to the lowest CCE index m of the PDCCH of the subframe withDAI=2 scheduling the PDSCH, and the HARQ-ACK resource of CH_4 isdetermined according to the CCE index m+1 of the PDCCH of the subframewith DAI=2 scheduling the PDSCH.

Case 4-3:

If the CC is a Scell, the CC requires 4 PUCCH 1a/1b channel resources totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. If the Scell is scheduled by itself, the method for obtainingthe CH_1, CH_2, CH_3 and CH_4 is as follows: configuring multiple PUCCH1a/1b channel resources semi-statically by higher layer signaling, andobtaining 4 PUCCH 1a/1b channel resources by mapping the multipleHARQ-ACK channels according to the ARI in the PDCCH scheduling the PDSCHof the Scell.

If the Pcell falls within case 3-1 or case 4-1 and the Scell fallswithin any one of cases 3-2, 3-3, 4-2 and 4-3, the UE transmits theHARQ-ACK feedback information on antenna 0 using CH_1 and transmits theHARQ-ACK feedback information repeatedly on antenna 1 using CH_2, asshown in table 3.

In the cases other than the above cases, suppose that ch_a, ch_b, ch_cand ch_d are channels used during channel selection when SORTD is notused. Then, the UE transmits the HARQ-ACK feedback information onantenna 0 using CH_1 and CH_3 and transmits the HARQ-ACK feedbackinformation repeatedly on antenna 1 using CH_2 and CH_4, as shown intable 10.

TABLE 10 Channel resources mapping table supporting channel selectionand SORTD transmit diversity Channel during Channel channel selectionresources mapped Antenna 0 Pcell ch_a CH_1 of Pcell ch_b CH_3 of PcellScell ch_c CH_1 of Scell ch_d CH_3 of Scell Antenna 1 Pcell ch_a CH_2 ofPcell ch_b CH_4 of Pcell Scell ch_c CH_2 of Scell ch_d CH_4 of Scell

Hereinafter, the present invention will be described in further detailwith reference to several examples.

EXAMPLE 1

Suppose that the UE is configured with the TDD and the number ofelements in the DAS is 1. The UE is configured with 2 CCs, respectivelyare a primary CC and a secondary CC. The PDSCH of the secondary CC iscross-carrier scheduled by the PDCCH of the primary CC. The primary CCis configured with the MIMO transmission mode and the secondary CC isconfigured with the MIMO transmission mode. The HARQ-ACK feedbackinformation is transmitted using PUCCH format 1b with channel selectionand the SORTD transmit diversity technique is adopted.

At this time, the primary CC falls within the above case 2-2. Theprimary CC requires 4 PUCCH 1a/1b channel resources to transmit theHARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3 and CH_4.CH_1 and CH_2 are obtained by mapping according to CCE indexes n and n+1of the PDCCH scheduling the PDSCH. CH_3 and CH_4 are obtained throughthe following method: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources through mapping the multiple HARQ-ACK channelsaccording to the ARI in the PDCCH scheduling the data transmission ofthe Pcell. For example, the ARI in the PDCCH scheduling the datatransmission of the Pcell may be obtained through re-defining the DAI.Since the number of elements of the DAS is 1 at this time, the DAI fieldin the PDCCH scheduling the PDSCH is not used and may be used as the ARIby re-defining.

The secondary CC falls within the above case 2-4. The secondary CCrequires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4. CH_1 andCH_2 are obtained by mapping according to CCE indexes n and n+1 of thePDCCH of the primary CC scheduling the PDSCH of the secondary CC. CH_3and CH_4 are obtained through the following method: configuring multiplePUCCH 1a/1b channel resources semi-statically by higher layer signaling,and obtaining 2 PUCCH 1a/1b channel resources through mapping themultiple HARQ-ACK channels according to the ARI in the PDCCH of thePcell scheduling the data transmission of the Scell.

The PUCCH 1a/1b channel resources mapping relationship in this exampleis shown in table 11.

TABLE 11 PUCCH resources mapping relationship (A = 4) Pcell Scell CH_1CH_2 CH_3 CH_4 CH_1 CH_2 CH_3 CH_4 cross-carrier n_CCE n_CCE + 1 ARI ARIn_CCE n_CCE + 1 ARI ARI scheduling (DAI) ( DAI ) Non-cross-carrier n_CCEn_CCE + 1 ARI ARI ARI ARI ARI ARI scheduling (DAI) (DAI)

EXAMPLE 2

Suppose that the UE is configured with the TDD working manner and thenumber of elements in the DAS is 1. The UE is configured with 2 CCs,respectively are a primary CC and a secondary CC. The PDSCH of thesecondary CC is cross-carrier scheduled by the PDCCH of the primary CC.The primary CC is configured with the SIMO transmission mode and thesecondary CC is configured with the SIMO transmission mode. The HARQ-ACKfeedback information is transmitted using PUCCH format 1b with channelselection and the SORTD transmit diversity technique is adopted.

At this time, the primary CC falls within the above case 2-1 andrequires 2 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1 and CH_2. CH_1 and CH_2 areobtained by mapping according to the CCE indexes n and n+1 of the PDCCHscheduling the PDSCH.

The secondary CC falls within the above case 2-3 and requires 2 PUCCH1a/1b channel resources to transmit HARQ-ACK feedback information,denoted by CH_1 and CH_2. CH_1 and CH_2 are obtained by mappingaccording to the CCE indexes n and n+1 of the PDCCH of the primary CCscheduling the PDSCH of the secondary CC.

In this example, the PUCCH 1a/1b channel resources mapping relationshipis shown in table 12.

TABLE 12 PUCCH resources mapping relationship (A = 2) Pcell Scellcross-carrier scheduling CH_1 CH_2 CH_1 CH_2 n_CCE n_CCE + 1 n_CCEn_CCE + 1 Non-cross-carrier CH_1 CH_2 CH_1 CH_2 scheduling n_CCE n_CCE +1 ARI ARI

EXAMPLE 3

Suppose that the UE is configured with the TDD and the number ofelements in the DAS is 1. The UE is configured with 2 CCs, respectivelyare a primary CC and a secondary CC. The PDSCH of the secondary CC isscheduled by the PDCCH of the secondary CC. The primary CC is configuredwith the MIMO transmission mode and the secondary CC is configured withthe SIMO transmission mode. The HARQ-ACK feedback information istransmitted using PUCCH format 1b with channel selection and the SORTDtransmit diversity technique is adopted.

At this time, the primary CC falls within the above case 2-2 andrequires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4. CH_1 andCH_2 are obtained by mapping according to the CCE indexes n and n+1 ofthe PDCCH scheduling the PDSCH. The method for obtaining the CH_3 andCH_4 is as follows: configuring multiple PUCCH 1a/1b channel resourcessemi-statically by higher layer signaling, and obtaining 2 PUCCH 1a/1bchannel resources through mapping the multiple HARQ-ACK channelsaccording to the ARI in the PDCCH scheduling the data transmission ofthe Pcell. For example, the ARI in the PDCCH scheduling the datatransmission of the Pcell may be obtained through re-defining the DAI.Since the number of elements of the DAS at this time is 1, the DAI inthe PDCCH scheduling the PDSCH is not defined. Therefore, the DAI fieldmay be re-defined to be used as the ARI.

The secondary CC falls within the above case 2-5 and requires 2 PUCCH1a/1b channels resources to transmit the HARQ-ACK feedback information,denoted by CH_1 and CH_2. CH_1 and CH_2 are obtained as follows:configuring multiple PUCCH 1a/1b channel resources semi-statically byhigher layer signaling, and obtaining 2 PUCCH 1a/1b channel resourcesthrough mapping the multiple HARQ-ACK channels according to the ARI inthe PDCCH scheduling the PDSCH of the Scell.

In this example, the PUCCH 1a/1b channel resources mapping relationshipis shown in table 13.

TABLE 13 PUCCH resources mapping relationship (A = 3) Pcell (MIMO) Scell(SIMO) CH_1 CH_2 CH_3 CH_4 CH_1 CH_2 cross-carrier n_CCE n_CCE + 1 ARIARI n_CCE n_CCE + 1 scheduling (DAI) (DAI) Non-cross- n_CCE n_CCE + 1ARI ARI ARI ARI carrier (DAI) (DAI) scheduling

In this example, if the primary CC is configured with the SIMOtransmission mode and the secondary CC is configured with the MIMOtransmission mode, the PUCCH 1a/1b channel resources mappingrelationship is shown in table 14.

TABLE 14 PUCCH resources mapping relationship (A = 3) Scell (MIMO) Pcell(SIMO) CH_1 CH_2 CH_3 CH_4 CH_1 CH_2 cross-carrier n_CCE n_CCE + 1 ARIARI n_CCE n_CCE + 1 scheduling Non-cross- n_CCE n_CCE + 1 ARI ARI n_CCEn_CCE + 1 carrier scheduling

EXAMPLE 4

Suppose that the UE is configured with the TDD and the number ofelements in the DAS is 2. The HARQ-ACK feedback information istransmitted using PUCCH format 1b with channel selection and the SORTDtransmit diversity technique is adopted.

The primary CC is configured with the MIMO transmission mode andrequires 4 PUCCH 1a/1b channel resources to transmit the HARQ-ACKfeedback information, denoted by CH_1, CH_2, CH_3 and CH_4. Subframes 0and 1 respectively provide 2 PUCCH 1a/1b channel resources. If no SPSservice is configured in the subframes, the HARQ-ACK resource of CH_1 isdetermined according to the lowest CCE index n of the PDCCH of subframe0 scheduling the PDSCH, the HARQ-ACK resource of CH_2 is determinedaccording to the CCE index n+1 of the PDCCH of subframe 0 scheduling thePDSCH, the HARQ-ACK resource of CH_3 is determined according to thelowest CCE index m of the PDCCH of subframe 1 scheduling the PDSCH, andthe HARQ-ACK resource of CH_4 is determined according to the CCE indexm+1 of the PDCCH of subframe 1 scheduling the PDSCH. If the SPS serviceis configured in the subframe, 2 PUCCH 1a/1b channel resources requiredby the subframe are 2 HARQ-ACK resources semi-statically configured byhigher layer signaling.

The secondary CC is configured with the MIMO transmission mode. PUCCHformat 1b with channel selection is adopted to transmit the HARQ-ACKfeedback information and the SORTD transmit diversity is adopted. Thesecondary CC requires 4 PUCCH 1a/1b channel resources to transmit theHARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3 and CH_4.Subframes 0 and 1 respectively provide 2 PUCCH 1a/1b channel resources.If the PDSCH of the Scell is cross-carrier scheduled by the PDCCH of thePcell, the HARQ-ACK resource of CH_1 is determined according to thelowest CCE index n of the PDCCH of subframe 0 scheduling the PDSCH, theHARQ-ACK resource of CH_2 is determined according to the CCE index n+1of the PDCCH of subframe 0 scheduling the PDSCH, the HARQ-ACK resourceof CH_3 is determined according to the lowest CCE index m of the PDCCHof subframe 1 scheduling the PDSCH, and the HARQ-ACK resource of CH_4 isdetermined according to the CCE index m+1 of the PDCCH of subframe 1scheduling the PDSCH.

If the Scell is scheduled by itself, the method for obtaining CH_1,CH_2, CH_3 and CH_4 is as follows: configuring multiple PUCCH 1a/1bchannel resources semi-statically by higher layer signaling, andobtaining 4 PUCCH 1a/1b channel resources through mapping multipleHARQ-ACK channels according to the ARI in the PDCCH scheduling the PDSCHof the Scell.

In this example, the PUCCH 1a/1b channel resources mapping relationshipis shown in table 15.

TABLE 15 PUCCH resources mapping relationship (M = 2) Pcell Scell CH_1CH_2 CH_3 CH_4 CH_1 CH_2 CH_3 CH_4 cross-carrier n_CCE n_CCE + 1 m_CCEm_CCE + 1 n_CCE n_CCE + 1 m_CCE m_CCE + 1 scheduling or the or the firstsecond SPS SPS resource resource Non-cross-carrier n_CCE n_CCE + 1 m_CCEm_CCE + 1 ARI ARI ARI ARI scheduling or the or the first second SPS SPSresource resource

EXAMPLE 5

Suppose that the UE is configured with the TDD working manner and thenumber of elements in the DAS is 3 or 4. The HARQ-ACK feedbackinformation is transmitted using PUCCH format 1b with channel selectionand the SORTD transmit diversity technique is adopted.

As to the primary CC, 4 PUCCH 1a/1b channel resources are required totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. If no SPS service is configured in one cell, the HARQ-ACKresource of CH_1 is determined according to the lowest CCE index n ofthe PDCCH of the subframe with DAI=1 scheduling the PDSCH, the HARQ-ACKresource of CH_2 is determined according to the CCE index n+1 of thePDCCH of the subframe with DAI=1 scheduling the PDSCH, the HARQ-ACKresource of CH_3 is determined according to the lowest CCE index m ofthe PDCCH of the subframe with DAI=2 scheduling the PDSCH, and theHARQ-ACK resource of CH_4 is determined according to the CCE index m+1of the PDCCH of the subframe with DAI=2 scheduling the PDSCH. If the SPSservice is configured in the subframe, 2 HARQ-ACK resources areconfigured by higher layers semi-statically for the SPS service, whereinCH_1 is the HARQ-ACK resource of the first HARQ-ACK resource configuredsemi-statically for the SPS service by higher layers, CH_2 is theHARQ-ACK resource of the first HARQ-ACK resource configuredsemi-statically for the SPS service by higher layers, the HARQ-ACKresource of CH_3 is determined according to the lowest CCE index n ofthe PDCCH of the subframe with DAI=1 scheduling the PDSCH, and theHARQ-ACK resource of CH_4 is determined according to the CCE index n+1of the PDCCH of the subframe with DAI=1 scheduling the PDSCH.

As to the secondary CC, 4 PUCCH 1a/1b channel resources are required totransmit the HARQ-ACK feedback information, denoted by CH_1, CH_2, CH_3and CH_4. If the PDSCH of the Scell is cross-carrier scheduled by thePDCCH of the Pcell, the HARQ-ACK resource of CH_1 is determinedaccording to the lowest CCE index n of the PDCCH of the subframe withDAI=1 scheduling the PDSCH, the HARQ-ACK resource of CH_2 is determinedaccording to the CCE index n+1 of the PDCCH of the subframe with DAI=1scheduling the PDSCH, the HARQ-ACK resource of CH_3 is determinedaccording to the lowest CCE index m of the PDCCH of the subframe withDAI=2 scheduling the PDSCH, and the HARQ-ACK resource of CH_4 isdetermined according to the CCE index m+1 of the PDCCH of the subframewith DAI=2 scheduling the PDSCH. Herein, the lowest CCE index of thePDCCH of subframe with DAI=1 scheduling the PDSCH is denoted by n, thelowest CCE index of the PDCCH of subframe with DAI=2 scheduling thePDSCH.

If the Scell is scheduled by itself, the method for obtaining CH_1,CH_2, CH_3 and CH_4 is as follows: configuring multiple PUCCH 1a/1bchannel resources semi-statically by higher layer signaling, andobtaining 4 PUCCH 1a/1b channel resources through mapping multipleHARQ-ACK channels according to the ARI in the PDCCH scheduling the PDSCHof the Scell.

In this example, the PUCCH 1a/1b channel resources mapping relationshipis as shown in table 16.

TABLE 16 PUCCH resources mapping relationship (M = 3, 4) Pcell ScellCH_1 CH_2 CH_3 CH_4 CH_1 CH_2 CH_3 CH_4 cross-carrier n_CCE n_CCE + 1m_CCE m_CCE + 1 n_CCE n_CCE + 1 m_CCE m_CCE + 1 scheduling or the or thefirst second SPS SPS resource resource Non-cross-carrier n_CCE n_CCE + 1m_CCE m_CCE + 1 ARI ARI ARI ARI scheduling or the or the first secondSPS SPS resource resource

It can be seen from the above technical solution that, according to themethod for allocating HARQ-ACK channel resources provided by theexamples of the present invention, it is possible to allocate HARQ-ACKchannel resources to the UE reasonably and avoid waste of channelresources in the premise that channel selection and SORTD technique aresupported.

FIG. 4 is illustrating the UE apparatus according to an exemplaryembodiment of the present invention.

Referring to FIG. 4, the UE includes transmission unit (400), receptionunit (410), and controller (420). The transmission unit (400) andreception unit (410) respectively include a transmission module and areception module for communicating with the Node B according to anexemplary embodiment of the present invention. The reception unit (410)receives PDCCH information and PDSCH data from a base station throughtwo CCs from a Node B.

The controller (420) obtains according to specific indicationinformation, PUCCH channel resources required for transmitting HARQ-ACKfeedback information using a transmit diversity technique.

The transmission unit (400) transmits HARQ-ACK feedback information onthe obtained PUCCH channel resources adopting the transmit diversitytechnique.

FIG. 5 is illustrating the Node B apparatus according to an exemplaryembodiment of the present invention.

Referring to FIG. 5, the Node B includes transmission unit (500),reception unit (510), and controller (520). The transmission unit (500)and reception unit (510) respectively include a transmission module anda reception module for communicating with the UE according to anexemplary embodiment of the present invention. For example, thetransmission unit (500) transmits PDCCH information and PDSCH data froma base station through two CCs from a Node B.

The controller (520) performs an operation of the Node B based on FIG. 3according to an exemplary embodiment of the p resent invention.

The foregoing descriptions are only preferred embodiments of thisinvention and are not for use in limiting the protection scope thereof.Any changes and modifications can be made by those skilled in the artwithout departing from the spirit of this invention and therefore shouldbe covered within the protection scope as set by the appended claims.

What is claimed is:
 1. A method for transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback information by a user equipment (UE) in a wireless communication system, the method comprising: determining a number of HARQ-ACK bits based on a number of serving cells and a downlink transmission mode for each of the serving cells, the downlink transmission mode including one of a first transmission mode that supports one transport block and a second transmission mode that supports up to two transport blocks; determining uplink resources associated with the HARQ-ACK bits; and performing HARQ-ACK transmission based on the HARQ-ACK bits using a part or all of the determined uplink resources through at least two antenna ports, the determined uplink resources being mapped to the at least two antenna ports, respectively, wherein the performing of the HARQ-ACK transmission comprises transmitting the same HARQ-ACK feedback information through the at least two antenna ports, and wherein a HARQ-ACK bit included in the HARQ-ACK bits represents a response for a transport block associated with one of the serving cells.
 2. The method of claim 1, wherein a number of the determined uplink resources is corresponded to a number of the HARQ-ACK bits.
 3. The method of claim 1, wherein the determined uplink resources includes first uplink resources for a first serving cell of the serving cells, the first uplink resources includes uplink resources for the second transmission mode of the first serving cell, and the first uplink resources are derived based on a number of a lowest control channel element (CCE) used for transmission of downlink control information of the first serving cell.
 4. The method of claim 3, wherein the first uplink resources are allocated to a first antenna port of the at least two antenna ports, and second uplink resources to be allocated to a second antenna port of the at least two antenna ports are configured by higher layers.
 5. The method of claim 1, wherein the HARQ-ACK bits are transmitted based on one of a frequency division duplexing (FDD) scheme and a time division duplexing (TDD) scheme.
 6. A method for receiving hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback information by a base station (BS) in a wireless communication system, comprising: receiving HARQ-ACK feedback information based on HARQ-ACK bits from a user equipment (UE), wherein the HARQ-ACK feedback information is transmitted from the UE using a part or all of uplink resources determined associated with the HARQ-ACK bits through at least two antenna ports of the UE, the uplink resources being mapped to the at least two antenna ports, respectively, wherein the same HARQ-ACK feedback information is transmitted through the at least two antenna ports, wherein a number of the HARQ-ACK bits is determined based on a number of serving cells for the UE and a transmission mode for each of the serving cells, the transmission mode including one of a first transmission mode that supports one transport block and a second transmission mode that supports up to two transport blocks, and wherein a HARQ-ACK bit included in the HARQ-ACK bits represents a response for a transport block associated with one of the serving cells.
 7. The method of claim 6, wherein a number of the uplink resources is corresponded to a number of the HARQ-ACK bits.
 8. The method of claim 6, wherein the uplink resources includes first uplink resources for a first serving cell of the serving cells, the first uplink resources includes uplink resources for the second transmission mode of the first serving cell, and the first uplink resources are derived based on a number of a lowest control channel element (CCE) used for transmission of downlink control information of the first serving cell.
 9. The method of claim 8, wherein the first uplink resources are allocated to a first antenna port of the at least two antenna ports, and second uplink resources to be allocated to a second antenna port of the at least two antenna ports are configured by higher layers.
 10. The method of claim 6, wherein the HARQ-ACK bits are transmitted based on one of a frequency division duplexing (FDD) scheme and a time division duplexing (TDD) scheme.
 11. A user equipment (UE) in a wireless communication system, comprising: a transceiver; and at least one processor configured to: determine a number of hybrid automatic repeat request acknowledgement (HARQ-ACK) bits based on a number of serving cells and a downlink transmission mode for each of the serving cells, the downlink transmission mode including one of a first transmission mode that supports one transport block and a second transmission mode that supports up to two transport blocks, determine uplink resources associated with the HARQ-ACK bits, and control the transceiver to perform a HARQ-ACK transmission based on the HARQ-ACK bits using a part or all of the determined uplink resources through at least two antenna ports, the determined uplink resources being mapped to the at least two antenna ports, respectively, wherein the at least one processor is further configured to control the transceiver to transmit the same HARQ-ACK feedback information through the at least two antenna ports, and wherein a HARQ-ACK bit included in the HARQ-ACK bits represents a response for a transport block associated with one of the serving cells.
 12. The UE of claim 11, wherein a number of the determined uplink resources is corresponded to a number of the HARQ-ACK bits.
 13. The UE of claim 11, wherein the determined uplink resources includes first uplink resources for a first serving cell of the serving cells, the first uplink resources includes uplink resources for the second transmission mode of the first serving cell, and the first uplink resources are derived based on a number of a lowest control channel element (CCE) used for transmission of downlink control information of the first serving cell.
 14. The UE of claim 13, wherein the first uplink resources are allocated to a first antenna port of the at least two antenna ports, and second uplink resources to be allocated to a second antenna port of the at least two antenna ports are configured by higher layers.
 15. The UE of claim 11, wherein the HARQ-ACK bits are transmitted based on one of a frequency division duplexing (FDD) scheme and a time division duplexing (TDD) scheme.
 16. A base station (BS) in a wireless communication system, comprising: a transceiver; and at least one processor configured to control the transceiver to receive hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback information based on HARQ-ACK bits from a user equipment (UE), wherein the HARQ-ACK feedback information is transmitted from the UE using a part or all of uplink resources determined associated with the HARQ-ACK bits through at least two antenna ports of the UE, the uplink resources being mapped to the at least two antenna ports, respectively, wherein the same HARQ-ACK feedback information is transmitted through the at least two antenna ports, wherein a number of the HARQ-ACK bits is determined based on a number of serving cells for the UE and a transmission mode for each of the serving cells, the transmission mode including one of a first transmission mode that supports one transport block and a second transmission mode that supports up to two transport blocks, and wherein an HARQ-ACK bit included in the HARQ-ACK bits represents a response for a transport block associated with one of the serving cells.
 17. The BS of claim 16, wherein a number of the uplink resources is corresponded to a number of the HARQ-ACK bits.
 18. The BS of claim 16, wherein the uplink resources includes first uplink resources for a first serving cell of the serving cells, the first uplink resources includes uplink resources for the second transmission mode of the first serving cell, and the first uplink resources are derived based on a number of a lowest control channel element (CCE) used for transmission of downlink control information of the first serving cell.
 19. The BS of claim 18, wherein the first uplink resources are allocated to a first antenna port of the at least two antenna ports, and second uplink resources to be allocated to a second antenna port of the at least two antenna ports are configured by higher layers.
 20. The BS of claim 16, wherein the HARQ-ACK bits are transmitted based on one of a frequency division duplexing (FDD) scheme and a time division duplexing (TDD) scheme. 